Class NatsEventStore
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Namespace: Cephalon.EventSourcing.Nats
Assembly: Cephalon.EventSourcing.Nats.dll
NATS JetStream KV-backed implementation of {streamId}/{streamVersion:D20}.
Zero-padding ensures correct lexicographic ordering of version keys.
Optimistic concurrency is enforced via a pre-append version check and CreateAsync
which throws
public sealed class NatsEventStore : IEventStoreInheritance
Section titled “Inheritance”Implements
Section titled “Implements”IEventStore
Inherited Members
Section titled “Inherited Members”object.Equals(object?), object.Equals(object?, object?), object.GetHashCode(), object.GetType(), object.ReferenceEquals(object?, object?), object.ToString()
Constructors
Section titled “Constructors”NatsEventStore(INatsConnection, string)
Section titled “ NatsEventStore(INatsConnection, string)”Initializes a new instance of the
public NatsEventStore(INatsConnection nats, string bucketName)Parameters
Section titled “Parameters”nats INatsConnection
The NATS connection (connection is deferred to first use).
bucketName string
The JetStream KV bucket name used to persist event stream entries.
Methods
Section titled “Methods”AppendAsync(string, IReadOnlyCollection<IDomainEvent>, long, CancellationToken)
Section titled “ AppendAsync(string, IReadOnlyCollection<IDomainEvent>, long, CancellationToken)”Appends one or more events to the requested stream after checking the expected version.
public Task AppendAsync(string streamId, IReadOnlyCollection<IDomainEvent> events, long expectedVersion, CancellationToken cancellationToken = default)Parameters
Section titled “Parameters”streamId string
The stable stream identifier.
events IReadOnlyCollection<IDomainEvent>
The events to append.
expectedVersion long
The current stream version expected by the caller. Use -1 to require a brand-new stream.
cancellationToken CancellationToken
The token that cancels the operation.
Returns
Section titled “Returns”A task that completes when the append finishes.
GetVersionAsync(string, CancellationToken)
Section titled “ GetVersionAsync(string, CancellationToken)”Gets the latest version known for the requested stream.
public Task<long> GetVersionAsync(string streamId, CancellationToken cancellationToken = default)Parameters
Section titled “Parameters”streamId string
The stable stream identifier.
cancellationToken CancellationToken
The token that cancels the operation.
Returns
Section titled “Returns”A task that returns the current stream version, or -1 when the stream does not exist.
ReadStreamAsync(string, long, CancellationToken)
Section titled “ ReadStreamAsync(string, long, CancellationToken)”Reads the requested stream from the supplied version onward.
public IAsyncEnumerable<IDomainEvent> ReadStreamAsync(string streamId, long fromVersion = 0, CancellationToken cancellationToken = default)Parameters
Section titled “Parameters”streamId string
The stable stream identifier.
fromVersion long
The first stream version to include. The default is 0.
cancellationToken CancellationToken
The token that cancels the operation.
Returns
Section titled “Returns”IAsyncEnumerable<IDomainEvent>
An async sequence of domain events in ascending stream-version order.